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Midland class 1000
Great Britain | 1902 | 35 produced
Locomotive Magazine, January 1906

In 1902, the Midland Railway had five express locomotives built, numbered 2631 to 2635, designed by Samuel White Johnson. The special feature was the power plant, which consisted of three cylinders with compound action. The high-pressure cylinder was below the smoke box, while the low-pressure cylinders were on the outside and got their steam from a common receiver. All three cylinders acted on the first driving axle

From 1905, Johnson's successor Richard Deeley had 30 more pieces built, which were initially numbered 1000 to 1029. They had some simplifications, especially in the area of valve gear. In 1907, the first five were renumbered 1000 through 1004, while the re-ordered machines were numbered 1005 through 1029. Ten more followed in 1908 and 1909, bringing the total to 45.

Sectional drawing
Sectional drawing
Locomotive Magazine, February 1902

With train weights typically ranging from 250 to 300 long tons, the locomotives reached average speeds in excess of 50 mph. On the incline between Settle and Carlisle, it was now possible to do without double-heading in some cases, while speeds of up to 85 mph could be ran downhill. Superheaters were retrofitted from 1914, saving 25.9 and 22.3 percent on coal and water, respectively. All 45 examples survived the formation of British Railways, but by 1953 all were gone.

VariantNo. 2631-2635No. 1000 etc.superheated
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length60 ft 10 in
Wheelbase24 ft 3 in
Fixed wheelbase9 ft 7 in
Total wheelbase48 ft 3 in
Empty weight121,695 lbs
Service weight131,065 lbs134,176 lbs
Adhesive weight85,649 lbs87,584 lbs
Total weight250,268 lbs229,376 lbs
Water capacity4,203 us gal
Fuel capacity17,248 lbs (coal)13,552 lbs (coal)
Power sourcesteam
Estimated power900 hp (671 kW)950 hp (708 kW)1,250 hp (932 kW)
Optimal speed29 mph27 mph36 mph
Starting effort19,713 lbf22,240 lbf
with start valve23,656 lbf26,688 lbf
Power Plant
Driver diameter84 in
Boiler pressure195 psi220 psi
Expansion typecompound
Cylindersthree, HP: 19 x 26 in
and LP: 21 x 26 in
Grate area28.4 sq ft
Firebox area152.8 sq ft151 sq ft
Tube heating area1,305.2 sq ft1,420.8 sq ft1,170 sq ft
Evaporative heating area1,458 sq ft1,573.7 sq ft1,321.1 sq ft
Superheater area290 sq ft
Total heating area1,458 sq ft1,573.7 sq ft1,611 sq ft
Calculated Values
steam locomotive
Samuel White Johnson
last changed: 07/2022

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